Medicolegal Autopsies — MCQs

Medicolegal Autopsies Indian Medical PG Practice Questions and MCQs

Question 51: In autopsy, through which approach is the spinal cord opened?

A. Anterior
B. Posterior (Correct Answer)
C. Lateral
D. Anterolateral

Explanation: **Explanation:** In medicolegal autopsies, the **Posterior approach** is the standard and most preferred method for exposing the spinal cord. This technique involves placing the body in a prone position and making a midline incision from the occiput down to the sacrum. The paravertebral muscles are reflected, and a laminectomy (removal of the vertebral arches) is performed using a saw or chisel to access the spinal canal. **Why Posterior is Correct:** The spinal cord is anatomically located closer to the dorsal surface of the body, protected by the vertebral laminae. The posterior approach provides the most direct access, allows for the removal of the cord with the nerve roots intact, and minimizes damage to the internal thoracic and abdominal viscera, which are usually examined separately. **Why Incorrect Options are Wrong:** * **Anterior:** While the spinal cord *can* be accessed anteriorly after removing the thoracic and abdominal organs (by sawing through the vertebral bodies), it is technically difficult, time-consuming, and often results in significant damage to the cord. It is rarely used except in specific cases of vertebral body pathology. * **Lateral/Anterolateral:** These approaches are surgically relevant (e.g., for decompression or disc surgery) but are not used in routine autopsy as they provide poor visualization of the entire length of the cord and are anatomically cumbersome. **High-Yield Facts for NEET-PG:** * **Prislo’s Method:** A specialized technique to remove the spinal cord along with the brain in one piece to maintain anatomical continuity. * **Indications:** Spinal cord examination is mandatory in cases of suspected poisoning (e.g., Strychnine), electrotraction, spinal trauma, or motor neuron diseases. * **Artifact:** Post-mortem "heat rigor" can sometimes mimic spinal cord lesions; careful dissection is required to differentiate.

Question 52: What is mummification?

A. Dessication of the body (Correct Answer)
B. Pugilistic attitude of the body
C. Electric burns
D. Burking

Explanation: **Explanation:** **Mummification** is a state of post-mortem decomposition characterized by the **dessication (dehydration)** of the body tissues. It occurs when the evaporation of body fluids happens at a rate faster than bacterial liquefaction (putrefaction). 1. **Why Option A is Correct:** Mummification occurs in hot, dry, and airy environments (e.g., deserts). The skin becomes dry, brittle, leathery, and dark brown or black, stretched tightly over the underlying bones. This process preserves the features and external injuries of the deceased for a long duration, which is of high medicolegal importance for identification. 2. **Why Other Options are Incorrect:** * **B. Pugilistic Attitude:** This refers to the "fencing posture" assumed by a body exposed to high heat or fire due to the heat-induced coagulation and contraction of flexor muscles. * **C. Electric Burns:** These are localized injuries (like the "Joule burn" or "entry mark") caused by the passage of electric current through the skin. * **D. Burking:** A historical method of homicidal asphyxia involving a combination of "smothering" (covering the nose/mouth) and "traumatic asphyxia" (kneeling on the chest), named after the murderers Burke and Hare. **High-Yield Facts for NEET-PG:** * **Timeframe:** Mummification usually takes **3 months to a year** to complete. * **Prerequisites:** High temperature, low humidity, and free circulation of air. * **Medicolegal Value:** It preserves the **identity** of the individual and evidence of **external injuries** (like ligature marks or stab wounds) for years. * **Internal Organs:** Unlike the skin, internal organs often degenerate into a thick, brown, greasy mass.

Question 53: During autopsy of suspected anesthetic poisoning, which container is used to preserve the lung excised from the hilum?

A. PVC container
B. Metal container (Correct Answer)
C. Nylon bag
D. Polyethylene bag

Explanation: ### Explanation **Correct Option: B (Metal container)** In cases of suspected **anesthetic poisoning** (volatile substances like ether, chloroform, or halothane), the lungs must be preserved in an **airtight metal container**. **The Underlying Concept:** Volatile anesthetic agents have a high vapor pressure and can easily permeate through plastic or rubber materials. If these organs are stored in standard plastic containers, the poison will escape via diffusion or evaporation, leading to a false-negative toxicological report. Metal containers (usually tin or galvanized iron) provide an impermeable barrier that prevents the loss of these volatile gases, ensuring they remain within the tissue for laboratory analysis. **Analysis of Incorrect Options:** * **A, C, & D (PVC, Nylon, and Polyethylene):** These are all forms of polymers. Volatile substances can dissolve into or pass through the molecular structure of plastics (a process called "sorption" or "permeation"). Additionally, certain solvents in the poison may react with or dissolve the plastic container itself, contaminating the sample. **High-Yield NEET-PG Pearls:** 1. **Preservation of Lungs:** For routine poisoning, lungs are usually not preserved. They are specifically preserved in cases of **volatile poisons**, **drowning** (for diatom analysis), and **inhalation of gases** (CO, HCN). 2. **Preservative Used:** No chemical preservative (like Saturated Saline) should be added to the container when testing for volatile poisons, as it may interfere with gas chromatography. The container should be packed in ice instead. 3. **Viscera Preservation:** For most routine poisonings, the preservative of choice is **Saturated Salt Solution**, except in cases of corrosive acid poisoning (where **Rectified Spirit** is used). 4. **Blood Samples:** For volatile poisons, blood should be collected in a glass vial with a Teflon-lined screw cap to prevent leakage.

Question 54: A city experiences 800 deaths per year. If bodies are stored for an average duration of 8 days with a mouary occupancy rate of 80% throughout the year, what is the minimum number of mouary beds required?

A. 22 (Correct Answer)
B. 17
C. 7
D. 34

Explanation: ### Explanation This question tests the practical application of **mortuary management and planning**, a high-yield topic in Forensic Medicine regarding the logistics of medicolegal autopsies. **The Calculation:** To determine the number of mortuary beds required, we use the formula for average daily occupancy adjusted for the utilization rate: 1. **Total Body-Days per year:** 800 deaths × 8 days storage = **6,400 body-days**. 2. **Average daily occupancy:** 6,400 body-days ÷ 365 days ≈ **17.53 beds**. 3. **Adjusting for 80% occupancy rate:** Since the facility should not be 100% full to allow for fluctuations, we divide the average occupancy by the occupancy rate: $17.53 / 0.80 = \mathbf{21.91}$. 4. Rounding up to the nearest whole number gives **22 beds**. **Analysis of Options:** * **A (22): Correct.** This accounts for both the total volume of deaths and the buffer required to maintain an 80% occupancy threshold. * **B (17): Incorrect.** This represents the raw average daily occupancy without accounting for the 80% utilization factor. * **C (7): Incorrect.** This value is too low and would result in severe overcrowding and hygiene issues. * **D (34): Incorrect.** This would represent an under-utilization of resources (approx. 50% occupancy), which is not cost-effective for hospital administration. **High-Yield Clinical Pearls for NEET-PG:** * **Ideal Storage Temperature:** For routine cases, bodies are stored at **4°C (39.2°F)**. For long-term storage or decomposed bodies, deep freezing at **-10°C to -20°C** is required. * **Legal Requirement:** In India, a medicolegal autopsy can only be performed after receiving a written requisition from the police (Inquest report/Form 25.35) or a Magistrate. * **Negative Autopsy:** An autopsy where no cause of death can be found even after gross, histological, and toxicological examination (occurs in ~2-5% of cases).

Question 55: A patient died due to jaundice. What color will the corpse be after embalming?

A. Grey
B. Green (Correct Answer)
C. Yellow
D. Brown

Explanation: ### Explanation The correct answer is **Green (Option B)**. **Medical Concept:** In a patient with jaundice (icterus), the tissues are saturated with **bilirubin** (yellow pigment). Embalming fluid typically contains **formaldehyde**, which acts as a potent oxidizing agent. When formaldehyde reacts with bilirubin in the tissues, it oxidizes the yellow bilirubin into **biliverdin**, which is green in color. This chemical conversion results in the corpse developing a distinct greenish hue post-embalming. To prevent this "greening" in clinical practice, embalmers often use specialized fluids with lower formaldehyde concentrations and specific surfactants. **Analysis of Incorrect Options:** * **Option A (Grey):** This is the typical color of a body after standard embalming due to the coagulation of proteins and the action of formaldehyde on normal tissues (often called "formaldehyde grey"), but it is not the specific reaction seen in jaundice. * **Option C (Yellow):** This is the color of the corpse *before* embalming due to hyperbilirubinemia. Once the oxidation reaction occurs during the embalming process, the yellow color transitions to green. * **Option D (Brown):** Brownish discoloration is usually associated with desiccation (mummification) or the formation of acid hematin (post-mortem staining), not the chemical reaction between jaundice and embalming fluid. **High-Yield Facts for NEET-PG:** * **Bilirubin + Formaldehyde $\rightarrow$ Biliverdin (Green).** * **Embalming Fluid Composition:** Typically contains Formaldehyde (preservative), Methyl alcohol (prevents polymerization), Glycerin (humectant), and Eosin (dye). * **Legal Requirement:** In India, embalming is mandatory for the international transportation of a body. * **Autopsy vs. Embalming:** Embalming should always be performed *after* a medicolegal autopsy, as it can mask findings or interfere with toxicological analysis.

Question 56: Which of the following statements regarding exhumation is true?

A. Should be performed within a time period of two years.
B. Requires a written order from the coroner. (Correct Answer)
C. Should ideally be performed under bright illumination, preferably at night.
D. All the above statements are true.

Explanation: **Exhumation** refers to the lawful disinterment of a body from its grave for medicolegal purposes, such as identifying the deceased or determining the cause of death when foul play is suspected. ### **Explanation of Options** * **Option B (Correct):** In India, exhumation requires a written order from an **Executive Magistrate** (e.g., District Magistrate or Sub-Divisional Magistrate). In countries following the Coroner system (like the UK or USA), a **Coroner’s order** is mandatory. Without legal authorization, digging up a body is a criminal offense. * **Option A (Incorrect):** There is **no time limit** for exhumation in India. It can be performed at any time as long as there is a valid legal order and the remains (even skeletal) are expected to provide evidence. * **Option C (Incorrect):** Exhumation should **always be performed in daylight**. Artificial light at night can distort the appearance of colors (e.g., post-mortem staining or poisoning signs) and may lead to the accidental destruction of evidence. ### **NEET-PG High-Yield Pearls** * **Authorized Personnel:** The procedure must be conducted in the presence of a **Medical Officer** and a **Police Officer**, supervised by the **Magistrate**. * **Sample Collection:** If poisoning is suspected, soil samples must be collected from above, below, and from all four sides of the coffin/body to rule out environmental contamination (soil arsenic). * **Identification:** The grave must be identified by the person who buried the body or by the cemetery registrar before digging begins. * **Legal Section:** In India, the Magistrate's power to order exhumation is derived from **Section 176(2) of the CrPC** (now Section 196 of the BNSS).

Question 57: Which of the following is false regarding the changes in vitreous humor after death?

A. Increased potassium
B. Decreased sodium
C. Decreased pyruvic acid
D. Raised glucose (Correct Answer)

Explanation: ### Explanation The correct answer is **D. Raised glucose**. In the postmortem period, glucose levels in the vitreous humor (and blood) **decrease rapidly** due to glycolysis. #### Why Option D is False: After death, cellular metabolism continues for a short period, and bacteria may also consume glucose. This leads to a significant drop in glucose levels, often reaching zero within a few hours. Therefore, a "raised" glucose level is never a normal postmortem finding; if glucose is found to be elevated (hyperglycemia) in the vitreous humor postmortem, it strongly suggests the deceased had **Diabetes Mellitus** or died in a state of hyperglycemia. #### Analysis of Other Options: * **A. Increased Potassium ($K^+$):** This is the most reliable biochemical marker for estimating the **Post-Mortem Interval (PMI)**. After death, the sodium-potassium pump fails, and $K^+$ leaks from the intracellular compartment (retinal cells) into the vitreous humor at a relatively constant rate. * **B. Decreased Sodium ($Na^+$):** Sodium levels show a gradual decline after death due to diffusion and the failure of active transport mechanisms. * **C. Decreased Pyruvic Acid:** Along with glucose, other metabolic substrates like pyruvic acid decrease as they are consumed during anaerobic glycolysis. #### NEET-PG High-Yield Pearls: * **Sturner’s Formula:** Used to calculate PMI based on vitreous potassium: $PMI = (7.14 \times K^+ \text{ concentration in mEq/L}) - 39.1$. * **Vitreous Humor Advantages:** It is the preferred fluid for postmortem biochemistry because it is anatomically isolated, protected from putrefaction, and less prone to rapid chemical changes compared to blood. * **Lactic Acid:** Unlike glucose, lactic acid levels **increase** after death due to anaerobic glycolysis. * **Hypoxanthine:** This also increases significantly after death and is used as an alternative marker for PMI estimation.

Question 58: All are true about medicolegal autopsy except?

A. Inquest required
B. Consent of relatives required (Correct Answer)
C. To find out the cause of death in unnatural deaths
D. To find out the time and manner of death

Explanation: **Explanation:** In Forensic Medicine, it is crucial to distinguish between a **Clinical (Pathological) Autopsy** and a **Medicolegal (Forensic) Autopsy**. **Why Option B is the correct answer:** In a medicolegal autopsy, the **consent of relatives is NOT required**. These autopsies are performed under legal mandate to investigate unnatural, suspicious, or sudden deaths. The body is technically in the legal custody of the state (Police or Magistrate). Refusal by relatives cannot stop a medicolegal autopsy if the investigating officer deems it necessary. In contrast, a clinical autopsy (done to study disease processes) requires informed consent from the next of kin. **Analysis of other options:** * **Option A (Inquest required):** This is true. A medicolegal autopsy can only be performed after a formal **Inquest** (legal inquiry into the cause of death) is conducted by either the Police (Section 174 CrPC) or a Magistrate (Section 176 CrPC). * **Options C & D (Purpose):** These are the primary objectives of a forensic autopsy. It aims to establish the **Cause of death** (the physiological derangement), the **Manner of death** (Suicidal, Homicidal, or Accidental), and the **Time since death** (post-mortem interval). **High-Yield Clinical Pearls for NEET-PG:** * **Legal Authority:** The requisition for a medicolegal autopsy is sent by the Police Officer (not below the rank of Sub-Inspector) or the Magistrate. * **Magistrate Inquest:** Mandatory in cases of custodial deaths, dowry deaths (within 7 years of marriage), or police firing. * **Dead Body Challan:** The formal document sent by the police to the doctor along with the body. * **No Time Limit:** Unlike clinical autopsies, a medicolegal autopsy should be performed as soon as possible, even at night if there are proper lighting facilities and it is an emergency (though usually avoided to prevent missing subtle color changes).

Question 59: Which of the following conditions is associated with the radiological 'Spalding sign'?

A. Mummification
B. Maceration (Correct Answer)
C. Hanging
D. Drowning

Explanation: ### Explanation **Spalding sign** is a classic radiological finding indicative of **intrauterine fetal death (IUFD)**. It is specifically associated with **maceration**, a sterile form of decomposition that occurs when a fetus dies in utero and remains within the amniotic fluid. #### Why Maceration is Correct: Maceration leads to the softening and liquefaction of fetal tissues. As the brain matter liquefies and the supporting intracranial pressure drops, the bones of the fetal skull lose their alignment. This results in the **overlapping of the fetal skull bones** at the sutures. This radiological overlap is known as Spalding sign and typically appears 24 to 48 hours after fetal death. #### Why Other Options are Incorrect: * **Mummification:** This is a form of decomposition occurring in dry, airy conditions where the body dehydrates. In utero, mummification occurs if amniotic fluid is deficient (e.g., papyraceous fetus), but it does not typically produce the specific skull overlapping seen in maceration. * **Hanging:** This is a cause of death due to constriction of the neck. Radiological signs in hanging might include fractures of the hyoid bone or cervical vertebrae, but not Spalding sign. * **Drowning:** This involves death by submersion in liquid. While "maceration" of the skin (washerwoman’s hands) occurs in drowning victims, the specific radiological "Spalding sign" refers exclusively to fetal skull changes in IUFD. #### High-Yield Clinical Pearls for NEET-PG: * **Robert’s Sign:** The presence of gas in the fetal heart and great vessels (earliest radiological sign of IUFD, appearing within 12 hours). * **Deuel’s Halo Sign:** Increased translucency (edema) around the fetal head due to scalp separation. * **Timeframe:** Maceration begins within 24 hours of death; if a fetus is born with signs of maceration, it proves the death was intrauterine and not a live birth.

Question 60: A completely charred body was brought for autopsy. While examining the skull and cranial cavity, a collection of blood in the epidural space is found. The presence of which of the following features suggests the possibility of a traumatic epidural hematoma?

A. Carboxyhemoglobin in the hematoma
B. Dark brown friable clot
C. Radiating fracture lines over the skull (Correct Answer)
D. Diffuse subdural hematoma

Explanation: In charred bodies, the most critical diagnostic challenge is distinguishing a **Heat Hematoma** (post-mortem artifact) from a **Traumatic Epidural Hematoma** (ante-mortem injury). ### **Why Option C is Correct** A **Traumatic Epidural Hematoma** is typically associated with a direct impact to the skull. The presence of **radiating fracture lines** crossing the vascular grooves (like the middle meningeal artery) strongly suggests that the hematoma resulted from mechanical trauma rather than heat. In contrast, heat-related fractures are usually irregular, "eggshell" in appearance, and do not follow anatomical lines. ### **Analysis of Incorrect Options** * **A. Carboxyhemoglobin in the hematoma:** This is a hallmark of a **Heat Hematoma**. As the body burns, carbon monoxide is absorbed into the blood; its presence in the clot indicates the hematoma formed during or after exposure to fire. * **B. Dark brown friable clot:** This describes the physical appearance of a **Heat Hematoma**. Heat causes the blood to coagulate into a chocolate-brown, crumbly, or "honeycombed" mass due to the expansion of steam. Traumatic clots are typically firm, elastic, and dark red. * **D. Diffuse subdural hematoma:** While trauma can cause subdural bleeds, it is not a specific diagnostic feature used to differentiate the origin of an *epidural* collection in a charred body. ### **High-Yield Clinical Pearls for NEET-PG** | Feature | Heat Hematoma (Artifact) | Traumatic Epidural Hematoma | | :--- | :--- | :--- | | **Location** | Usually bilateral, over frontal/parietal lobes | Usually unilateral, at site of impact | | **Clot Appearance** | Brown, friable, "honeycombed" | Dark red, firm, elastic | | **Skull Fracture** | Eggshell/Fissured (Heat fractures) | Linear/Radiating (Traumatic) | | **Blood Chemistry** | **High Carboxyhemoglobin** | Normal Carboxyhemoglobin | | **Brain Compression** | Minimal/Absent | Significant (Mass effect) | **Key Concept:** A heat hematoma occurs because the intense heat causes the skull to expand and the dura to shrink away from the bone, creating a vacuum that pulls blood and marrow into the epidural space.

Practice by Chapter

Objectives of Medicolegal Autopsy

Practice Questions

Autopsy Procedures

Practice Questions

External Examination

Practice Questions

Internal Examination

Practice Questions

Special Autopsy Techniques

Practice Questions

Organ Retention and Disposal

Practice Questions

Collection of Toxicological Samples

Practice Questions

Autopsy Report Writing

Practice Questions

Histopathology in Autopsies

Practice Questions

Microbiology in Autopsies

Practice Questions

Radiology in Autopsies

Practice Questions

Limitations and Artifacts

Practice Questions

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